Suspicious whitespace sequence

[kalipto]

Hi,

Sometimes, I received JPG pictures by mail whose titles contain 6 white spaces instead of one. For instance: "town near      the river". Avast doesn't really appreciate it and displays a "Suspicious message" window mentioning a "suspicious whitespace sequence"  
Since I don't think the picture sender intentionnaly inserted white spaces in his picture title (it happens regularly with always 6 white spaces instead of 1), does someone know if a virus could do that ? I tried to make research on google for that but I didn't find anything. These pictures were stored on an iPaq before being sent to me. This behavior is recent. No problem before.
Thanks for your help.

[Culpeper]

Have you completed a virus scan yet?  If nothing shows up than you probably have nothing to worry about, naturally.

[Vlk]

The message is (a bit) suspicious because some viruses use the following trick: they've an attachment called e.g.

Info.txt                                                                               .exe

Because the window in which the names are displayed has a size limitation, it's quite likely that the .exe extension will not be displayed (will be clipped), making the user think that it's a TXT file, instead of an EXEcutable.

If you want, you can turn off the whitespace checking but in 99.9% of cases you shouldn't really see any (legal) attachments with names like that...

[kalipto]

Thanks a lot for your answers.
Actually, I scanned  my disk and found no particular viruses.
I am really happy to understand why Avast was so suspicious. But the attached files with names with spaces were no exe (pcw or most often jpg). So I don't really know the reason of these additional spaces. Maybe a mailer bug. But the pocket PC (iPaq) where the original files were stored before being mailed to me, had been infected previously by a virus called "HTML.redolf.A". I mean the storage card contained files infected by this virus. The infected files were supposed to be eradicated. But I don't really think there is a link...